All that is needed for this magnetic GPS tracker to function is a working SIM card simply insert your sim card and get online on your smartphone or PC and you can see wherever your GPS tracker goes it is magnetic there for you gets secretly stick it underneath the hood underneath the bumper or maybe you just simply want to have a safe for your child and stick it in that little side pocket of their backpack it gets mileage range of 75 miles distance and 72 hours before you need to recharge the battery this is a wonderful device and the only thing that you need to make it function is a working functioning SIM card simply answered the SIM card and follow the instruction manual that comes with it in order to connect with the tracker this is a great device I have won several of my friends have one we all love them